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We propose a rigorous theoretical simulation of the homojunction solar cell spectral response which allows us to derive the absoption spectra of the given samples and to study the influence of high energy particle beams on the cellperformances.Moreover, the computation based on our model provide the values of certain microscopical parameterswhich are consequently used in solar cells design optimization. Keywords:solar cells, irradiation, spectral response 1 INTRODUCTION The action of high energy particle beams (electrons, protons, neutrons, X-quanta) may strongly change the energyspectrum corresponding to the induced crystalline defects in the Si solar cell structure,1 2: one of them implies anincreasing in the electron-lattice interaction for the electrons laying in the higher valence states, thus strengtheningtheir localization degree; an other one leads to a decrease in the interaction energy and of the localization degree as well. One may describe the effects of these phenomena,3 in terms of the energy gap value and of its variation as afunction of the electronic valence states. The energy gap changing is also recognizable in the spectral response ofthe photocurrent or photovoltage. It is obviously displaced towards smaller wavelengths (larger energy values) inthe first analyzed case, while in the second one we measured a displacement in the opposite direction.A meaningful and rigorous form of the spectral response is given if we use a theoretical model depending on the |
